When running inside a headless process such as within Visual Studio's NPM Task Runner, any ng command throws an error due to process.stdin not being implemented #4870

OS?

Any Windows, running from VS2015 NPM Task Runner or through one of the project.json scripts

Versions.

@angular/cli: 1.0.0-beta.32.3
node: 6.9.5
os: win32 x64

Repro steps.

• Set up an app with ng new
• Add the app to an ASP.NET Core project in VS2015 with outputs set to wwwroot
• Attempt to run one of the npm scripts using the NPM Task Runner, such as test, which results in the log below

The log given by the failure.

`

ng test
internal/process/stdio.js:82
throw new Error('Implement me. Unknown stdin file type!');
^
Error: Implement me. Unknown stdin file type!
at process.getStdin [as stdin] (internal/process/stdio.js:82:15)
at D:\DEV\PoC\Ang2App\src\Ang2App\node_modules@angular\cli\bin\ng:149:27
at D:\DEV\PoC\Ang2App\src\Ang2App\node_modules\resolve\lib\async.js:45:21
at ondir (D:\DEV\PoC\Ang2App\src\Ang2App\node_modules\resolve\lib\async.js:188:31)
at D:\DEV\PoC\Ang2App\src\Ang2App\node_modules\resolve\lib\async.js:154:39
at onex (D:\DEV\PoC\Ang2App\src\Ang2App\node_modules\resolve\lib\async.js:94:22)
at D:\DEV\PoC\Ang2App\src\Ang2App\node_modules\resolve\lib\async.js:25:18
at FSReqWrap.oncomplete (fs.js:123:15)
npm ERR! Windows_NT 6.1.7601
npm ERR! argv "C:\Program Files\nodejs\node.exe" "C:\Users\f_ceotto\AppData\Roaming\npm\node_modules\npm\bin\npm-cli.js" "run" "test" "--color=always"
npm ERR! node v6.9.5
npm ERR! npm v4.3.0
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! ang2-app@0.1.0 test: ng test
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the ang2-app@0.1.0 test script 'ng test'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the ang2-app package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! ng test
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs ang2-app
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls ang2-app
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! C:\Users\f_ceotto\AppData\Roaming\npm-cache_logs\2017-02-21T12_04_28_453Z-debug.log

Process terminated with code 1.
`

Mention any other details that might be useful.

This is a common issue with a few packages that use process.stdin when running in Windows. A common solution is to replace the process.stdin with an event emitter when running in a headless environment in Windows and I can submit a pull request that addresses the issue like that, but I've also attached a patch with the same:

fix_win32_process_stdin.patch.txt